DE2747676A1 - PISTON-CYLINDER UNIT - Google Patents

Description

October 19, 19 ^ 74 η D 5607 retr.

J
iesto-Jiaschinenfabrik Gottlieb Stoll, 7500 Esslingen

Piston-cylinder unit

The invention relates to a piston-cylinder unit with a cylinder whose at least one end face is a Is assigned to the cylinder cover, which hits a radially directed stop surface on the cylinder against a on Cylinder loosely seated and fixed in axial direction towards the cylinder cover by a radially projecting contact surface The union ring can be releasably tensioned, e.g. with the help of screws.

In known arrangements of this type, a bing groove is worked into the wall of the cylinder in the area of its end face, in which a e.g. slotted clamping ring is inserted. When bracing the cylinder cover against the The cylinder cover strikes the coupling ring against the front edge of the cylinder, if the coupling ring is attached puts on the tension ring.

As a result of the ring groove receiving the clamping ring, the

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ORIGINAL INSPECTED

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Cylinders have a much greater turning thickness, than they are in terms of strength in terms of the inside medium pressures occurring in the cylinder is necessary. The known arrangement is therefore material-intensive and negligibly expensive to manufacture. The effort is also particularly great because the clamping ring is a separate part. Furthermore, the large wall thickness results in relatively heavy cylinders. Finally, the massive formation of the cylinder wall has the disadvantage that for reasons of cost which often no corrosion-resistant material is used, so that the known arrangements for a use e.g. in the food industry, the chemical industry, the beverage industry or in the Electroplating is often not suitable.

Similar disadvantages are also present with a different type of connection between cylinder and cylinder cover, in which the cylinder cover is screwed into the face of the cylinder. Again, because of the arrangement of the thread on the cylinder the wall thickness of which must be greater than that seen from the internal pressure.

The present invention is therefore based on the object of providing a piston-cylinder unit of the type mentioned at the beginning

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create that does not have the disadvantages mentioned and in which the wall thickness of the cylinder can be measured according to the internal pressures occurring, without the Connection stability suffers.

According to the invention, this object is achieved in that the end face of the cylinder is bent in the radial direction is and that the radially bent Hingpartie with its axially outer end face the impact surface and with its axially inner end face forms the contact surface.

In this way, there is no need for a separate clamping ring, the function of which is taken over by the bent part. Together with the clamping ring, there is also no need to arrange an annular groove, so that the wall thickness of the connection is unaffected. All in all, this results a simpler and cheaper arrangement that has few parts, is light in weight and with a minimum can be produced in terms of material costs. The latter enables production from corrosion-resistant material z. B. made of V2A steel, without this being excessive Production becomes more expensive. Another advantage is that the bent singing part both the attachment surface. for the cylinder cover as well forms the contact surface for the coupling ring, so that when » Tension the tension exerted and that of it

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opposing counterforce act on the same cylinder area, namely on the bent part. This bent part is, so to speak, wedged between the cylinder cover and the coupling ring. Opposite a torque is exerted on the clamping ring in the known arrangement, since the contact surface is offset radially is arranged to serve as a stop surface cylinder front edge, which can lead to bending.

In principle, the hanging part can also be bent inwards in a radial view. In order not to unnecessarily reduce the cylinder interior and the piston stroke to affect, it is useful that the Hingpartie bent outward in the radial direction is.

The radially bent part can be expediently made by axial upsetting, pressing or flanging, e.g. tumbling flanging, be made.

In an embodiment which is particularly favorable in terms of stability, it is provided that the radially bent Hingpartie an axially outer, the stop surface forming turn as well as one parallel to the outer turn running, this opposite and the adjacent

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Location 1> 11 contains the inner turn leading from the outer bend is separated by a 180 ° fold. Here the free end of the bent part becomes sweckmässigerweise formed by the inner bend.

Ausführungebeispiel ^e the invention will now be described with reference to the drawing

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7ig. 1 the Lingaach section of a piston-cylinder unit in Subdivision

? ig. 2 the length section of the cylinder of a different design of the invention in partial representation.

In llg. 1 is a cylinder 1 of a piston-cylinder unit shown, in which a piston la linear Kiehung not included in the drawing is guided back and forth movable. A cylinder cover 2 is arranged on the end face of the cylinder 1 and is penetrated centrally τοη of the piston rod 3. It goes without saying that the present invention also applies to full cylinder covers. The cylinder cover 2 is 16sbar connected to 4em cylinder 1, in-deai he hit on a radially directed abutment flat «4 on cylinder 1

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against a coupling ring 5 that is loosely seated on the cylinder is clamped with the help of screws 6, which are in aligned bores 7 »8 of the cylinder cover 2 and the coupling ring intervention. The coupling ring 5 is only in the direction loosely displaceable away from the cylinder cover 2 (with loosened screws 6), while it moves axially towards the cylinder cover 2 Direction is fixed by a radially projecting contact surface 9 on the cylinder 1.

Vie from fig. 1 can be seen, the face of the Cylinder 1 bent in the radial direction, so that a radially bent ring belt 10 is formed. You axially The outer end face of the ring belt 10 forms that of the cylinder cover 2 associated stop surface 4, while the axially inner end face of the ring belt 10 that of the coupling ring represents associated contact surface 9. When tensioning or fastening the cylinder cover with the help the screws 6 are so the union ring 5 and the Cylinder cover 2 pressed from different sides against the bent ring belt 10, the clamping force and the opposing force directed against it, d. H. the two of the coupling ring 5 and the cylinder cover 2 exercised Frees forces with the same radius and with the same amount act on the ring belt 10. In this way you get a stable connection that can be released at any time.

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This type of connection does not affect this in any way

the wall thickness of the cylinder 1, d. H. the wall thickness can

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on internal pressures occurring only from deP in the cylinder

dependent minimum value.

You Singpartie 10 is in a radial seal to, out of sen turned. As a result, the volume of the cylinder interior is not impaired and the piston stroke is not restricted, as would be the case with an inwardly bent Üingpartie, which is easily understandable.

for the production of the bent part 10 there is various possibilities. So she can z. B. by axial upsetting, by pressing or by flanging, e.g. wobble flanging be made.

Also in the case of the exemplary embodiment according to FIG a bent bing area 11 is present on the cylinder 12, in FIG The cylinder cover and the piston rod are not shown, which are the same as in the case of the exemplary embodiment according to FIG. 1 are formed. You hanging part 11 now contains an axially outer ibbiegung 13 and a parallel to this outer bend 13 and opposite this

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lying inner bend 14, the two bends 13 »14 separated from one another by a 180 ° fold 15 are. Here, the turn 13 forms the sere the stop surface 16 associated with the cylinder cover, while the inner bend 14 is the one associated with the coupling ring Contact surface 17 forms. Viewed overall, in this case there is an arrangement in which along a surface line of the cylinder 12 is initially a 90 ° bend 18 is present, onto which the outer bend extending in the radial direction outwards 13 follows, which is then folded over the 180 - 15 in the inner bend 14 passes over. The free end 19 of the bent fiing part 11 is therefore from the inner bend 14 formed.

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Claims (5)

D 56Ü7 dltr. 19th October 1977 tfesto-flaschinenfabrik Gottlieb Stoll, Essiingen Piston-cylinder unit Expectations iiy'l piston cylinder unit with a cylinder whose A cylinder cover is assigned to at least one end face, which cover strikes against a radially directed stop surface on the cylinder against one loosely seated on the cylinder and towards the cylinder cover in an axial direction by means of a radially protruding contact surface, the coupling ring can be releasably clamped, e.g. with the help of screws is, characterized in that the end face of the cylinder (1, 12) is bent in a radial direction and that the radially bent Hingpartie (10,11) with its axially outer end face the stop surface (4,16) and with its axially inner end face the contact surface (9,17) -2- 909817/0485 forms. 2. Piston-cylinder unit according to claim 1, characterized in that that the hanging part (10, 11) is bent outwards in a radial seal. 3. Piston-cylinder unit according to claim 1 or 2, characterized in that the radially bent fiingpaifce is made by axial upsetting, pressing or flanging, e.g. wobble flanging. 4. Piston-cylinder unit according to one of claims 1 to 3, characterized in that the radially bent fiingpai & e (11) a bend (13) forming axially from sera, the stop surface (16), and a bend parallel to the outer bend (13) running, this opposite and the contact surface · (17) forming inner bend (14), which from the outer Al
(15) is separated. from the outer bend (13) through a 180 fold 5. Piston-cylinder unit according to claim 4, characterized in that that the free end (19) of the bent part (11) is formed by the inner bend (14) will. 909817/0485